The enigma of the ring structure Richat Structure
Shaped like concentric circles with a diameter of approximately 40 to 50 kilometers these formations are clearly visible from space and are important excavation sites in Niger Chad and Morocco they demonstrate human adaptation to the arid climate of the Sahara Desert near Ouaden Mauritania the Risat structure also known as the "Eye of the Sahara" was once believed to be an impact crater. Geologists now believe it's a structure formed by the uplift of a geological dome over millions of years
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Sedimentary igneous and quartzite rocks each layer of varying ages with the innermost layer being the oldest form one of the most striking geographical features fossils of grassland animals stone tools and ancient water sources confirm the Sahara's once abundant natural resources the natural erosion of tectonic plates pushing the dome up into shape over millions of years is not the result of an impact
The Sahara Desert reveals evidence of prehistoric human settlements ancient burial sites and cave paintings from the time when the Sahara was a lush green grassland Green Sahara dating from 10,000 to 3,000 BC. This includes the discovery of Oldowan and Acheulean tools in Algeria and Libya dating back to the earliest human era pottery and rock art along the Atlas Mountains and other areas and the Richat Structure also known as the "Eye of the Sahara" a remarkable geological phenomenon in the Sahara
